PAL output

Ok, I give up. I'm trying to get output out of the svideo connector,
but I can't set it to PAL. I've tried changing the DSS settings at no
success. I can change the resolution but not the timings. It seems to
stick to 60Hz. This also means that I won't get anything useful
through the DVI-D (my telly wants 720p50Hz).
  Please advise.